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Insomnia – Difficulty falling or staying asleep.
Itching (Pruritus) – Persistent skin irritation or urge to scratch.
Inflammation – Swelling, redness, and pain in tissues due to injury or infection.
Irritable Bowel Syndrome (IBS) – Abdominal pain, bloating, and irregular bowel movements.
Irregular heartbeat (Arrhythmia) – Abnormal heart rhythm, either too fast or too slow.
Impaired vision – Blurry, double, or reduced vision.
Immune system dysfunction – Weak immune response leading to frequent infections.
Impotence (Erectile dysfunction) – Inability to maintain an erection.
Incontinence – Loss of bladder or bowel control.
Iron deficiency anemia – Low red blood cell count causing fatigue and weakness.
Inner ear problems – Issues with balance and hearing, possibly causing dizziness.
Ingrown toenails – Toenails growing into the skin, causing pain and infection.
Inflamed joints (Arthritis) – Swelling and stiffness in the joints.
Intestinal cramps – Pain in the stomach or intestines.
Icterus (Jaundice) – Yellowing of the skin and eyes due to liver problems.
Increased thirst (Polydipsia) – Excessive thirst, often a sign of diabetes.

Irritability – Easily annoyed or angered.
Impaired concentration – Difficulty focusing on tasks.
Intrusive thoughts – Unwanted, repetitive thoughts that cause distress.
Insecurity – Feelings of low self-worth or self-doubt.
Indecisiveness – Struggling to make decisions, often linked to anxiety or depression.
Intense fear (Phobia) – Extreme and irrational fear of specific objects or situations.
Impaired memory – Difficulty remembering things, possibly due to stress, dementia, or trauma.
Isolation tendencies – Avoiding social interaction or withdrawing from others.
Inappropriate laughter or crying – Emotional responses that don't fit the situation, often seen in neurological disorders.
Identity confusion – Uncertainty about one's sense of self, common in dissociative disorders.
Impulse control issues – Acting without thinking, common in ADHD and personality disorders.
Incoherent speech – Disorganized or difficult-to-understand speech patterns.